Improvement in stem-calipers



PATENT GTTIGE.

WILLIAM C. CROSS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN STEM-CALIPERS.

Specification forming part of Letters Patent No. 129,536, dated July 16,1872.

To allpersons to whom these presents shall come:

Be it known that I, WILLIAM C. ORoss, of Boston, in the county of Suolkand State of Massachusetts, have invented a new and Improved Caliper orGauge; and that the following is a full, clear, and exact description ofthe same, reference being had to the accompanying plate of drawingforming a part thereof.

This invention relates to a caliper or gauge more particularly designedfor measuring the internal diameter of cylinders, pipes, Svc.; but it issusceptible of use for many other and various purposes, such as spacingthe distance between spindles in a spinning-machine, setting off ashoulder or shoulders on a spindle shaft or bolt, as from the followingdescription will be obvious to all conversant with the use of tools.

In the accompanying plate of drawing my improved caliper or gauge isillustrated, Figure 1 being a side view of the same, and Fig. 2 acentral longitudinal section.

A in the drawing represents my improved caliper or gauge, constructed ofa body, B, that is hollow, and at each end split for a portion of itslength in four lines, and also made With a male screw-thread, a; O andD, stems, inserted, the one, C, loosely in the end'E of body B, and theother, D, by screwing it into the bodyB at end F, the bore and stembeing provided with a corresponding male and female screw-thread; Gr Gr,two screw-nuts, one on each screw-threaded end of body B. By these nuts,as the ends to the body B are split, the stems D and E can be fastenedWithin the body B, or set free to be drawn or screwed out erin, and thusadjusted to project more or less from the ends of the body.

In using a gauge such as above described, irst set the gauge through thestem C to about the diameter or space to be measured; then fasten suchstem by properly turning the nut G therefor, and then, place the gaugewithin the bore or other place to be measured; adjust the screw-stem Dthereto, and then secure it by properly turning its nut G.

It is obvious my improved gauge is simple, efficient, and reliable, andwhen once adjusted and fastened is secure against accidentaldisplacement.

The stems D and E, either one or both, may be graduated by inches, or byany suitable divisions of an inch7 so that, in conjunction with thelength of the body, the' length of gauge, jwhen adjusted, can beascertained and read. f

Having thus described my improved caliper or gauge, I will state myclaim as follows:

What l claim as my invention, and desire to secure by Letters Patent, is

A gauge or caliper composed of body B,

stems O D, and nuts G, substantially as and for the purpose described.

The above specilication of my invention signed by me this 16th day ofDecember, A. D. 1871.

WILLIAM C. CROSS.

Witnesses:

EDWIN W. BROWN, 'ALBERT W. BROWN.

